The idea that ducks' quacks do not echo is not a new one, but it has been discredited by modern researchers. Experiments in which ducks were encouraged to quack in enclosed areas have resulted in echo recordings. The origin of this misconception is not entirely clear, although it is assumed that because ducks normally do not quack very loudly, the resulting echo would be difficult for many humans to hear.
More about animals and sounds:
- Another popular misconception is that a wolf's howl does not echo, but there is proof to the contrary.
- Marine animals make sounds and then use the resulting echoes to determine the proximity of barriers or food sources.
- The cry of a bat is too high of a frequency for humans to hear. The echoes of these cries allow the bat to navigate its environment.
More Info: http://animaldiversity.ummz.umich.edu/
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